Optical pickup apparatus for use with various types of optical d

Details Optical pickup apparatus for use with various types of optical d Optical pickup apparatus for use with various types of optical d

1998-04-30

2000-09-26

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369110, G11B 700

Patent

active

061250910

ABSTRACT:
An optical pickup apparatus comprises a first semiconductor laser, a first beam splitter which partially reflects or transmits a laser beam generated by the first semiconductor laser in a given direction, a second semiconductor laser which emits a laser beam having a different wave length from the laser beam of the first semiconductor laser, a second beam splitter which partially reflects or transmits the laser beam generated by the second semiconductor laser in a given direction, a single photodetector which receives laser beams from the first and second semiconductor lasers when the laser beams are reflected by a recording medium, and a first reflective portion which is formed on the first beam splitter. The first reflective portion partially reflects a given polarized light beam from the first semiconductor laser and transmits a polarized light beam from the second semiconductor laser beam, which differs from the given polarized light beam. A second reflective portion is formed on the second beam splitter. The second reflective portion partially reflects a given polarized light beam from the second semiconductor laser and transmits a polarized light beam from the first semiconductor laser beam, which differs from the given polarized light beam.

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patent: 5933401 (1999-08-01), Lee et al.
patent: 5974020 (1999-10-01), Ju et al.
patent: 5999509 (1999-12-01), Sugiura et al.

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